Eager Beaver 20 Ton XPT, Руководство по обслуживанию, Страница: 45 / 59

9
A. Grease cam bracket and spider fittings prior to brake
shoe installation.
B. Adjust the slack adjuster until the brake lining comes
into contact with the brake dru m .
1. For green brakes* there should be a slight amount of
wheel drag at initial adjustment to compensate for any
lining irregularities (high spots, etc.).
*A “green bra ke” is an unground, unburnished bra ke. There is a
b re a k-in period where the lining will seat into a normal conact
p a t tern with the drum.
2. For burnished or broken-in brakes, back off the
slack adjuster to achieve .010" clearance between
d rum and shoe.
C. Apply brakes using normal truck operating pre s s u re .
( Average line pre s s u re should be 90 psi.)
1. Check the amount of push rod travel. Maximum
should not exceed 2.5" for Type 30 Long Stroke
chambers, 2" for Type 30 chambers and 1 3/4" for
Type 24 chambers.
a. Optimum pushrod travel on a green brake*
should be under 2".
b. Optimum pushrod travel on a burnished or
b roken-in brake should be under 1 3/4".
2. Check the angle between the slack adjuster and push
rod. With the brakes applied, the angle should be 90
d e g rees +/- 5 degre e s .
WARNING C
A R E M U ST B E E X E RC I S E D TO P R E V E N T
G R E A S E F RO M C O M I N G I N C O N TAC T W I T H B RA K E L I N I N G S W H I C H
C O U L D C AU S E A R E D U C T I O N I N B RA K I N G P E R FO R M A N C E
.
R
E D U C E D B RA K I N G P E R FO R M A N C E C O U L D C AU S E A N AC C I D E N T
R E S U LT I N G I N S E R I O U S I N J U RY O R D E AT H
.
WARNING U
S E O F A I R P R E S S U R E I N E XC E S S O F
130
P S I
C O U L D R E S U LT I N FA I L U R E O F T H E A I R C H A M B E R O R S P R I N G B RA K E
C H A M B E R
,
W H I C H C O U L D R E S U LT I N S E R I O U S I N J U RY O R D E AT H
.
• B
RA K EL I N I N G SC O N TA I NN O N
-
A S B E STO SF I B E RS
• B
R E AT H I N GB RA K ED U S T M AY B EH A Z A R D O U S TO YO U R H E A LT HA N D M AY
C AU S E S E R I O U SR E S P I RATO RY O R OT H E RB O D I LY H A R M
.
• A
VO I DC R E AT I N GD U S T
.
• D
O N
’
T R E M OV EB RA K ED RU M W I T H O U TP RO P E R P ROT E C T I V E E QU I P M E N T
.
• D
O N OT WO R KO N L I N I N G SW I T H O U TP RO P E RP R OT E C T I V EE QU I P M E N T
.
• D
O N OT R E P L AC EL I N I N G SW I T H O U TP RO P E RP R OT E C T I V E E QU I P M E N T
.
• D
O N
’
T AT T E M P T TO SA N D
,
G R I N D
,
C H I S E L
,
F I L E
,
H A M M E RO RA LT E RB RA K E
L I N I N G SI NA N Y M A N N E R W I T H O U TP RO P E RP R OT E C T I V E E QU I P M E N T
.
• F
O L LOW
O.S.H.A.
STA N DA R D S FO R P RO P E R P ROT E C T I V E D E V I C E S TO B E
U S E D W H E N WO R K I N G W I T HB RA K EM AT E R I A L S
.
WA R N I N G
WARNING I
T I S C R I T I C A L T H AT A N Y B RA K E D RU M
R E AC H I N G M A X I M U M W E A R D I A M E T E R
,
A S C A ST O N D RU M
,
BY
T U R N I N G
,
G R I N D I N G
,
A N D
/
O R W E A R I N G B E C O N S I D E R E D U N SA F E
A N D I M M E D I AT E LY R E P L AC E D
. I
N O R D E R TO AVO I D S E R I O U S I N J U RY
O R D E AT H
,
A N Y B RA K E D RU M E XC E E D I N G T H I S D I M E N S I O N I S
C O N S I D E R E D A SA F E T Y H A Z A R D
. I
F I N D O U B T
,
C O N TAC T T H E
B RA K E D RU M M A N U FAC T U R E R
.
3. For burnished brakes, apply pre s s u re to brakes and
check for lining to drum contact. Using a .010" feeler
gauge, the lining to drum contact should range from 60
to 100% during brake application.
4. Check to ensure the lining is inside the drum during
application. More than .060" pro t ruding out of the
d rum is not re c o m m e n d e d .
D. Rapidly release air pre s s u re from the brakes and
c o n firm that all brakes quickly release to the norm a l
relaxed position.
RECOMMENDED BRAKE ADJUSTMENT PRO C E D U R E
C AUTION F
A I L U R E TO P RO P E R LY A D J U ST B RA K E S C O U L D
C AU S E R E D U C E D B RA K I N G P E R FO R M A N C E
.
C AUTION W
H E N AU TO M AT I C B RA K E A D J U ST E RS A R E
U S E D
,
I T I S N E C E S SA RY TO FO L LOW T H E I N STA L L AT I O N A N D
A D J U ST M E N T P RO C E D U R ER E C O M M E N D E D BY T H E AU TO M AT I C
B RA K E A D J U ST E R M A N U FAC T U R E R
. F
A I L U R E TO FO L LOW T H E R E C
-
O M M E N D E D P RO C E D U R E C O U L D R E S U LT I N I M P RO P E R O P E RAT I O N
O F T H E AU TO M AT I C S L AC K A D J U ST E R
,
R E S U LT I N G I N R E D U C E D
B RA K E P E R FO R M A N C E O R P R E M AT U R E L I N I N G W E A R
.
D22/P22 Manual pdf 9/23/97 2:47 PM Page 11